Fluid handling – Flow affected by fluid contact – energy field or coanda effect – Responsive to condition external of system
Patent
1979-11-13
1981-07-14
Recla, Henry J.
Fluid handling
Flow affected by fluid contact, energy field or coanda effect
Responsive to condition external of system
12820424, 12820426, 12820718, 137829, 137DIG9, F15C 112
Patent
active
042781108
ABSTRACT:
A demand responsive flow controller for use in a respiration system for the administration of oxygen from a pressurized source through a cannula to a patient is disclosed. A flow path between the pressurized source and the cannula is opened and closed by a fluidic valve which is responsive to the presence and absence of a low pressure power stream developed by a flow restrictor coupled to the pressurized source. The low pressure power stream is applied to the control port of the on/off fluidic valve by a monostable fluidic switch which conducts the low pressure power stream through the valve control port of the on/off valve in response to expiration by the patient, and which diverts the low pressure power stream away from the on/off valve in response to inspiration by the patient. In a preferred embodiment, the monostable fluidic switch is gate controlled and includes a discharge port through which the power stream is conducted only in response to a respiration signal corresponding with expiration, and an open vent port through which the power stream is conducted only in response to a respiration signal corresponding with inspiration. A fluidic transducer is coupled to the cannula and to the gate controlled port of the monostable fluidic switch for opening and closing the gate control port to ambient pressure in response to inspiration and expiration, respectively.
REFERENCES:
patent: 2868199 (1959-01-01), Hudson
patent: 3368555 (1968-02-01), Beasley
patent: 3446207 (1969-05-01), Metivier
patent: 3486502 (1969-12-01), Wilson
patent: 3537449 (1970-11-01), Foxwell et al.
patent: 3598116 (1971-08-01), Peters et al.
patent: 3952740 (1976-04-01), Scurlock
patent: 4072148 (1978-02-01), Munson et al.
Howard Douglas C.
Price Ernest H.
Griggs Dennis T.
Recla Henry J.
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